ML20236W803

Summarizes Status of Plant Recovery from 871002 Turbine Bldg Fire.Investigations,Restorations,Mods & Testing by Util Required Prior to Restart,Expected to Be Completed by 871205

ML20236W803
Person / Time
Site:	Fort Saint Vrain
Issue date:	12/03/1987
From:	Robert Williams PUBLIC SERVICE CO. OF COLORADO
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
P-87419, TAC-66365, NUDOCS 8712080241
Download: ML20236W803 (5)

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P.O. Box 840 December 3,.1987- Denver, co 80201- 0840 Fort St. Vrain Unit No. 1 R.o. wrLL.Aus, JR.

P-87419 VICE PRESIDENT NUCLEAR OPERATIONS U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555 Docket No. 50-267-SUB'ECT: Fire Recovery Summary

REFERENCES:

See Attachment 1 Gentlemen:

The purpose of this letter is to summarize the status of the recovery of Fort St. Vrain.from the October 2, 1987, . Turbine Building fire.

The investigations, restorations, modifications, and testing identified by Public Service Company of Colorado (PSC), as required prior to plant restart, are expected to be complete by December 5, 1987. PSC is currently preparing for plant restart according to the attached " rise to power schedule". (Attachment 2)

BACKGROUND Following the Turbine Building fire on October 2, 1987, PSC immediately began formulating a plan for plant recovery The preliminary findings of the NRC's Augmented Inspection Team, provided to PSC at an exit meeting on October 6, 1987, were factored into this planning. By letter of October 19, 1987 (Reference 1), PSC advised the NRC of its general approach to the recovery activities and the conditions which would be required for restart. At a meeting with the NRC staff on October 30, 1987, PSC presented both a preliminary impact assessment of the fire (Reference 3), and our detailed action plans for both the immediate recovery of the plant and the longer term investigations and follow-up actions envisioned. These plans incorporated the request for additional information provided to PSC by NRC on October 22, 1987 (Reference 2). The NRC Augmented Inspection Team attended this meeting and provided PSC a copy of their final report (Reference 4). The NRC documented the October 30, 1987, meeting in a letter dated November 9, 1987, and requested additional information (Reference 5). PSC has provided the requested information to the NRC in a letter dated November 23, 1987 (Reference 6). On November 17, 1987, the NRC initiated an inspection of the PSC fire recovery plan, examining both work complete and work in [

progress. An interim exit meeting on November 19, 1987, provided L assurance that the details of PSC's recovery plan were proceeding as anticipated. The inspection is currently ongoing and is expected to ,0 QV be complete by December 4, 1987. l( \

8712080241 871203 PDR ADOCK 05000267 F PDR w__________________

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P-87419' December 3, 1987 ROOT CAUSE ANALYSIS The fire on October 2, 1987 in the Turbine Building, resulted when a thermal relief valve on a hydraulically operated valve was unable to-

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-l reseat due to a missing orifice. The oil' confinement system was l unable to accommodate the quantity of oil flow from the discharge of the thermal relief valve. The hydraulic oil contacted the hot t surface of the hydraulically operated valve and reached sufficient temperature to ignite. The details of this evaluation are identified in PSC's preliminary report (Reference 3). 1 PRIOR-TO-RESTART WORK

SUMMARY

PSC has conducted investigations of the hydraulic oil, control room l HVAC and fire detection systems. PSC has verified that the hydraulic j oil flow characteristics for each thermal relief valve with the j orifice installed is compatible with the oil confinement system capability. PSC has verified the installation of all orifices on those hydraulically operated valves which have thermal relief valve assemblies. In addition, steps have been added to work instructions to clarify the replacement method of the hydraulic filter canisters.

The control room HVAC has been analyzed and a modification to relocate the sensing port line to improve positive pressure control has been completed. The control room filter and reactor building filters have been tested and found acceptable.

PSC is continuing the improvements to the fire detection system which I were on going prior to the October 2nd fire.

LONG TERM ACTIVITIES PSC' has identified longer term activities in the Preliminary Report (Reference 3) and PSC's November 23 letter (Reference 6) that are not 1 considered required for startup of Fort St. Vrain. I These activities involve further investigations into the hydraulic oil, control room HVAC, and fire detection systems for possible enhancements. Project teams have been assembled and progress is being made in these areas.

TESTING

SUMMARY

l Overall assurance of system operability is being controlled by a PSC  !

startup book. The PSC startup book has pre-identified all required ]

tests, Technical Specification requirements, and operational  !

l prerequisites, and requires specific authorization signatures which l j control the pre-startup and rise to power activities. This book j

supplements the routine startup operational requirements, j l

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P-87419 December 3, 1987 Technical Speci fi cati c,.s cenpliance is maintained by PSC's test program. This test p rog. oin . provides assurance that repairs and modifications are appropriately completed,- system functional requirements are satisfied, and Technical Specification surveillance requirements 'are validated. Upon completion of the fire recovery repair / modification work, a combination- of cold checkout tests, functional tests, surveillance tests, post maintenance tests, and special tests will assure functional acceptability. prior to the system / component being returned to service. PSC is also preparing a cross reference list identifying applicable Technical Specification surveillance requirements associated with the equipment repaired or modified to the test performed.

CONCLUSION PSC's prior to restart fire recovery activities are nearing completion, and the plant is in the final stages of being readied for return to power operation. The NRC has been fully appraised of both PSC's prior to restart fire recovery activities, and PSC's longer term fire protection enhancement plans. Upon completion of the remaining prior to restart fire recovery activities by December 5, 1987, PSC will be ready to take the Fort St. Vrain plant critical and resume power operation.

Very truly yours, O

R. O. Williams, Jr.

Vice President, Nuclear Operations R0W/JMG/ lmb Attachments cc: Regional Administrator, Region IV ATTN: Mr. T. F. Westerman, Chief Projects Section B Mr. Robert Farrell  ;

Senior Resident Inspector {

! Fort St. Vrain i

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1 Attachment 1 to P-87419 December 3, 1987

REFERENCES:

1) PSC Letter, Williams to NRC, dated 10/19/87 (P-87374)

2) NRC Letter, Heitner to Williams,.

dated 10/22/87 (G-87382) ,

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3) Preliminary. Report on the Impact of the October 2nd Fire dated 10/30/87

4) NRC Augmented Inspection Report Callan to Williams, dated 10/29/87 (G-87387)

5) NRC Meeting Minutes, Heitner to Calvo, dated 11/9/87 (G-87402)

6) PSC Letter, Williams to Calvo dated 11/23/87 (P-87414)

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